curl --request POST \
  --url https://api.fincept.in/quantlib/solver/finance/oas \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "price": 102.5,
  "scenario_cashflows": [
    [
      3,
      3,
      103
    ],
    [
      3,
      3,
      3,
      103
    ],
    [
      3,
      103
    ]
  ],
  "times": [
    1,
    2,
    3,
    4
  ],
  "probabilities": [
    0.4,
    0.4,
    0.2
  ],
  "base_rates": [
    0.03,
    0.035,
    0.04,
    0.042
  ],
  "base_times": [
    1,
    2,
    3,
    4
  ]
}
'

import requests

url = "https://api.fincept.in/quantlib/solver/finance/oas"

payload = {
    "price": 102.5,
    "scenario_cashflows": [[3, 3, 103], [3, 3, 3, 103], [3, 103]],
    "times": [1, 2, 3, 4],
    "probabilities": [0.4, 0.4, 0.2],
    "base_rates": [0.03, 0.035, 0.04, 0.042],
    "base_times": [1, 2, 3, 4]
}
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    price: 102.5,
    scenario_cashflows: [[3, 3, 103], [3, 3, 3, 103], [3, 103]],
    times: [1, 2, 3, 4],
    probabilities: [0.4, 0.4, 0.2],
    base_rates: [0.03, 0.035, 0.04, 0.042],
    base_times: [1, 2, 3, 4]
  })
};

fetch('https://api.fincept.in/quantlib/solver/finance/oas', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.fincept.in/quantlib/solver/finance/oas",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'price' => 102.5,
    'scenario_cashflows' => [
        [
                3,
                3,
                103
        ],
        [
                3,
                3,
                3,
                103
        ],
        [
                3,
                103
        ]
    ],
    'times' => [
        1,
        2,
        3,
        4
    ],
    'probabilities' => [
        0.4,
        0.4,
        0.2
    ],
    'base_rates' => [
        0.03,
        0.035,
        0.04,
        0.042
    ],
    'base_times' => [
        1,
        2,
        3,
        4
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.fincept.in/quantlib/solver/finance/oas"

	payload := strings.NewReader("{\n  \"price\": 102.5,\n  \"scenario_cashflows\": [\n    [\n      3,\n      3,\n      103\n    ],\n    [\n      3,\n      3,\n      3,\n      103\n    ],\n    [\n      3,\n      103\n    ]\n  ],\n  \"times\": [\n    1,\n    2,\n    3,\n    4\n  ],\n  \"probabilities\": [\n    0.4,\n    0.4,\n    0.2\n  ],\n  \"base_rates\": [\n    0.03,\n    0.035,\n    0.04,\n    0.042\n  ],\n  \"base_times\": [\n    1,\n    2,\n    3,\n    4\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("X-API-Key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.fincept.in/quantlib/solver/finance/oas")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"price\": 102.5,\n  \"scenario_cashflows\": [\n    [\n      3,\n      3,\n      103\n    ],\n    [\n      3,\n      3,\n      3,\n      103\n    ],\n    [\n      3,\n      103\n    ]\n  ],\n  \"times\": [\n    1,\n    2,\n    3,\n    4\n  ],\n  \"probabilities\": [\n    0.4,\n    0.4,\n    0.2\n  ],\n  \"base_rates\": [\n    0.03,\n    0.035,\n    0.04,\n    0.042\n  ],\n  \"base_times\": [\n    1,\n    2,\n    3,\n    4\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.fincept.in/quantlib/solver/finance/oas")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"price\": 102.5,\n  \"scenario_cashflows\": [\n    [\n      3,\n      3,\n      103\n    ],\n    [\n      3,\n      3,\n      3,\n      103\n    ],\n    [\n      3,\n      103\n    ]\n  ],\n  \"times\": [\n    1,\n    2,\n    3,\n    4\n  ],\n  \"probabilities\": [\n    0.4,\n    0.4,\n    0.2\n  ],\n  \"base_rates\": [\n    0.03,\n    0.035,\n    0.04,\n    0.042\n  ],\n  \"base_times\": [\n    1,\n    2,\n    3,\n    4\n  ]\n}"

response = http.request(request)
puts response.read_body

{
  "success": true,
  "data": {
    "oas": 0.0085
  }
}

{
  "detail": "Invalid API key"
}

{
  "detail": "Endpoint requires Basic tier or higher"
}

{
  "detail": [
    {}
  ]
}